Anomalies in the electronic stopping of slow antiprotons in LiF
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916581784682496 |
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| author | Massillon-JL, Guerda Correa, Alfredo A. Andrade, Xavier Artacho, Emilio |
| author_facet | Massillon-JL, Guerda Correa, Alfredo A. Andrade, Xavier Artacho, Emilio |
| contents | We present first-principles theoretical calculations for the electronic stopping power (SP) of both protons and anti-protons in LiF. Our results show the presence of the Barkas effect: a higher stopping for positively charged particles than their negatively charged antiparticles. In contrast, a previous study has predicted an anti-Barkas effect (higher stopping for negative charges) at low velocity [Qi, Bruneval and Maliyov, Phys. Rev. Lett. 128, 043401 (2022)]. We explain this discrepancy by showing that this anti-Barkas effect appears for highly symmetric trajectories and disappears when considering trajectories that better reproduce the experimental setup. Our low-velocity results show that the SP of both protons and anti-proton vanish for velocities under 0.1 a.u. . |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_14381 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalies in the electronic stopping of slow antiprotons in LiF Massillon-JL, Guerda Correa, Alfredo A. Andrade, Xavier Artacho, Emilio Other Condensed Matter We present first-principles theoretical calculations for the electronic stopping power (SP) of both protons and anti-protons in LiF. Our results show the presence of the Barkas effect: a higher stopping for positively charged particles than their negatively charged antiparticles. In contrast, a previous study has predicted an anti-Barkas effect (higher stopping for negative charges) at low velocity [Qi, Bruneval and Maliyov, Phys. Rev. Lett. 128, 043401 (2022)]. We explain this discrepancy by showing that this anti-Barkas effect appears for highly symmetric trajectories and disappears when considering trajectories that better reproduce the experimental setup. Our low-velocity results show that the SP of both protons and anti-proton vanish for velocities under 0.1 a.u. . |
| title | Anomalies in the electronic stopping of slow antiprotons in LiF |
| topic | Other Condensed Matter |
| url | https://arxiv.org/abs/2501.14381 |